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An alluminum ball 0.5 cm in diameter initially at 250 C is dropped into a large tank of fluid (with Tsat=100 C), which is maintained at 25 C. The average heat transfer coefficient is approximately equal to 3000 W/m^2 C for boiling and 250 W/m^2 C for nonboiling. Determine the temperature of the ball after 10 seconds? (Properties of aluminum, density=2700 kg/m^3, Cp=896 J/kg C, k=236 W/m C and gamma=k/density *Cp)
an insulated piston-cylinder device initially contains 0.15m3 of air at 150kpa and 22degc. the cylinder is connected to
suppose lithium is dissolved interstitially in silicon. would you expect the lithium atoms to be donors or acceptors?
a full revolution press has 100 rpm flywheel rotation.it has two handed trip devices mounted 20 inches from point of operation how many engagement points on the flywheel would be nessary to make this machine safe?
an electric moter drivers an axial fan assuming that the desired air velocity 65degree f existing the fan is 50mph and
Briefly explain the difference between fatigue striations and beachmarks in terms of both size and origin.
Prepare a Journal paper on Renewable Energy
If the beam has square cross section of 9 in., on each side, determine the absolute maximum bending stress in the beam.
if you are standing in a room that is held at a constant 75 f and your body temperature remains at a constant 98.6 f
a piston-cylinder device contains 5 kg of refrigerant-134a at 0.7 mpa and 60 degrees c. the refrigerant is now cooled
consider a steam rankine cycle with superheat. the maximum temperature and pressure are 540 c and 60 bar and the
vinefera grapes are picked when the outside temperature is 35c and then cooled to 5c within a 12-h period. for each
The slotted wheel rolls to the right without slipping,
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